/Engine/Source/Runtime/GeometryCore/Public/DynamicMesh/DynamicMeshAttributeSet.h
Standard Normal overlay type - 3-element float
typedef [TDynamicMeshVectorOverlay](API\Runtime\GeometryCore\DynamicMesh\TDynamicMeshVectorOverlay)< float, 3, FVector3f > FDynamicMeshNormalOverlay